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arXiv 2407.18262physics.ao-phphysics.space-ph
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太阳活动与印度喀拉拉邦的极端降雨

Solar activity and extreme rainfall over Kerala, India

Elizabeth Thomas, S. Vineeth, Noble P. Abraham

AI总结:

本文研究了太阳活动指数与印度喀拉拉邦极端降雨的关系,发现两者在冬季相关性更强,且降雨盈亏年份多出现在太阳极大或极小期附近,为极端降雨的可预测性提供了物理假设。

摘要:

本文研究了太阳活动与印度喀拉拉邦极端降雨事件之间的关系。喀拉拉邦在冬季和季风季节分别接收最少和最多的降雨。考虑的太阳指数为太阳黑子数、F10.7指数和宇宙射线强度,并研究了它们在57年(1965-2021),即从第20太阳周期开始的降雨变化。对每个太阳周期进行了相关性研究,并计算了相关系数。我们发现喀拉拉邦的降雨与太阳黑子活动相关,但显著性程度不同。在第21太阳周期期间,冬季和季风季节的降雨与太阳活动均具有高显著性的相关性。研究了不同太阳指数随降雨的变化。冬季比季风季节表现出太阳与降雨之间更好的联系。计算了降雨盈余和不足的年份,并与太阳指数进行了比较。{我们发现降雨过剩和赤字的年份主要发生在太阳极大期或极小期附近(在$\pm$2年内)。}我们假设太阳活动与喀拉拉邦极端降雨事件之间存在物理关系,这有助于提高其可预测性。

英文摘要:

This paper examines the relationship between solar activity and extreme rainfall events in Kerala, India. Kerala receives minimum and maximum rainfall during winter and monsoon seasons. Sunspot number, F10.7 Index, and cosmic ray intensity are the solar indices considered, and their variations with rainfall are studied over 57 years (1965-2021), i.e., starting from Solar Cycle 20. Correlative studies are performed for each solar cycle, and correlation coefficients are calculated. We find that rainfall in Kerala is correlated with sunspot activity but with varying degrees of significance. During Solar Cycle 21, rainfall and solar activity are correlated with high significance during both winter and monsoon seasons. The variation of different solar indices with rainfall is studied. The winter season showed a better link between the sun and rainfall than the monsoon season. The years with rainfall surplus and deficiency are calculated and compared with the solar indices. {We find that the years with rainfall excess and deficit mainly occur in the years around solar maximum or minimum (within $\pm$2 years).} We hypothesize a physical relationship between solar activity and extreme rainfall events in Kerala that contributes to their predictability.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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